Vacuum-tube device.



A. McL. NICOLSON.

VACUUM TUBE DEVICE.

APPLICATION man 0CT.27.1914.

Patented Aug. 29, 1916.

LWA'M,

W/fnesses:

Mvenior: @8714. I Ala finder M-Zewn Nico/$0M ann'x an MoLnAn' nroorson, or TARRYTOWN, NEW v'onx, nssronon, BY IVIESNE TS, TO WESTERN. ELECTRIC COMPANY, INCORPORATED, A CORPORATION VACUUM-TUBE DEVICE.

IJWFA'YT.

Specificatif ers Patent. Patented Aug, 29 1916,

Application filed October 27, 1914. Serial No. 868,840.

i To all whom it may concern:

- the following is a .full,clear, concise, and

exact description. I

This invention relates to vacuum tubes or vessels and more particularly to thermionic devices of the audion type.

The object of this invention is to provide a new and improved form of thermionic device of compact structure and one which may be operated efficiently on high power circuits. a

In accordance with the general features of this invention there is provided a vessel for the audion in which the electrodes may be located closely adjacent the walls; the

' vessel is also constructed in such a manner that the electrodes may be located adjacent opposing walls, either or both of which may have extraneous cooling means applied thereto.

In the drawings Figure 1 isa view in side elevation with parts in section of a device illustrating one form of the invention. Fig.

2 is sectional view of the device taken upon line 2-2 of Fig.1. Fig. 3 is a view illuse trating one method of applying the cooling or output electrode '7, the filament 8and the V input element or electrode .9. The outside of the cylindrical wall 5 and the inside of the cylindrical wall 6 are both exposed so that cooling means may be readily applied thereto.

drical in shape and of substantially the same diameter as the inner surface of the outer cylindrical wall 5 so that when in position for operation this electrode 7 will be held in place by frictional engagement with the adjacent surface of the wall 5. The input element or inner electrode 9 is also cylindrical in form and is adapted to embrace the inner cylindrical wall 6 of the vessel and be supported thereby. The filament 8 may take the form of a coil spiraled around the inner electrode 9 as shown in the drawings. Conductors 10, 11, 12 and 13 maybe led into the elements in the usual manner for vacuum tubes, the conductor 10 being connected with the electrode 7, the conductor 11 with the,

electrode 9 and the conductors 12 and 13 with the opposite ends of the filament 8. The conductor 13 which is attached to one end of the filament 8 is led through a glass tube or insulating bushing 15 located between the inner surface of the wall 5 and .the electrode 7 in a depression 16 formed in said electrode 7.

In Fig. 3 the device previously described is-shown as immersed in a cooling fluid 20 contained within a vessel 21.

In Fig. 4 thecooling means is applied only to the inner wall by circulation. In this scheme a cooling tank 25, is placed above the device and. tubes 26 and 27 opening into said tank are led into the opposite ends of the inner cylinder 6 through suitable stoppers 28 and 29. In this arrangement only the inner wall 6 is cooled by the fluid, the outer wall 5 being cooled suficiently by radiation. 1

By reason of the location of the electrodes adjacent opposing walls which are accessible for the application of cooling means there is provided an eficient and compact structure capable of being worked on highpower circuits without danger of the detrimental phenomenon heretofore experienced.

The invention claimed is:

1. In a thermionic device of the audion type, a containing vessel having opposing walls, a pair of separated electrodes comprising conducting coatings on the inner surfaces of said walls and conforming thereto, and means for cooling outer surfaces of said walls. The anode or. output electrode 7 is cyliny 2. In a thermionic device ofthe audion type, an evacuated vessel having opposing walls, a pair of separated electrodes comprising conducting coatings of uniform thickness on the inner surfaces of said walls,

fand means for cooling said walls.

.. 3, In a thermionic device of the audion type, a pair'of concentrically arranged electrodes, a containing vessel having inner and outer concentrically arranged walls closely adjacent said electrodes, and cooling means for the 'Walls of said vessel.

4:. In a thermionic device of the audion type, a vessel comprising concentrically arrangedwalls connected together at bothends, output and input electrodes located '10 closely adjacent the inner faces of said Walls,

. and a cathode located between said electrodes.

5. In a thermionic device'of the audion type the combination of a vessel comprising concentric cylindrical walls closed at each end between said walls and open within the inner tube, a cylindrical input electrode sur rounding and closely adjacent the inner cylindrical wall of said vessel a cylindrical output electrode within and closely adjacent in the form of a spiral filament surrounding said input electrode.

In witness whereof, I hereunto subscribe my name this 26 day of October A. D., 1914.

' ALEXANDER MGLEAN NIGOLSON.

Witnesses:

E. Ennnn, K. L. STAHL. 

